<!-- <script lang="ts">
import { onMount } from "svelte";
import * as Cesium from 'cesium';
let viewer
  onMount(() => {
 let cesiumcontainer = document.getElementById('cesiumcontainer')
   viewer = new Cesium.Viewer( cesiumcontainer, {
    // baseLayerPicker: false,
    // imageryProvider: CustomDataSource,
    terrainProvider: Cesium.createWorldTerrain({
      requestVertexNormals: true,
      requestWaterMask: true
    })
  });
  viewer.camera.setView({
    destination: Cesium.Cartesian3.fromDegrees( 120.779711,40.620517, 2000)
  })
}
</script>

<div id="cesiumcontainer" /> -->
